Dynamic Influence of Sustained Small Rainfall Infiltration on Stability of Unsaturated Soil Slope
LIU Zizhen,YAN Zhixin,PENG Ningbo,DUAN Jian and REN Zhihua
DOI:10.11835/j.issn.1674-4764.2012.04.004
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2012,Pages 19-23
- Abstract
Taking the moisture content as main control parameter of shear strength of the soil, we analyze the variational properties of moisture content and shear strength with the change of rainfall time during the small sustained rainfall infiltration, and establish the relationships between total cohesion as well as effective angle of friction and the time of sustained small rainfall infiltration into an unsaturated slope. With the rainfall infiltration, the influence area of slope expands. Through the strength reduction method based on FLAC3D, the dynamic safety factor of slope in different time and the duration time before the failure of the slope are obtained. The results show that the slope critical sliding surface is yet unsaturated during a sustained small rainfall.